package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.common.R;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.impl.CategoryServiceImpl;

import com.itheima.reggie.service.impl.DishFlavorServiceImpl;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * 菜品管理
 */
@RestController
@RequestMapping("/dish")
@Slf4j
public class DishController {
    @Autowired
    private DishService dishService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 新增菜品
     * @param dishDto
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto){
        dishService.saveWithFlavor(dishDto);
        //清理所有菜品的缓存数据
        //Set keys = redisTemplate.keys("dish_*"); //获取所有以dish_xxx开头的key
        //redisTemplate.delete(keys); //删除这些key
        //清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);
        return R.success("新增菜品成功");
    }

    /**
     * 分页查询
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page,int pageSize,String name){
        //先在菜品表中查询出菜品获取菜品的page类
        //在对page中的每一个records的每个record采集到DishDto中并通过分类id在分类表中查询分类名赋值到DishDto对象中，然后
        Page<DishDto> dishDtoPage = new Page<>(page, pageSize);
        Page<Dish> dishPage = new Page<>(page, pageSize);

        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper=new LambdaQueryWrapper<>();
        //添加过滤条件
        queryWrapper.like(name != null,Dish::getName,name);
        //添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);

        //执行分页查询
        dishService.page(dishPage,queryWrapper);

        //dishDtoPage克隆该page,除records
        BeanUtils.copyProperties(dishPage,dishDtoPage,"records");
        List<Dish> records = dishPage.getRecords();
        //由分类id获取分类名
        List<DishDto> list = records.stream().map((item)->{
            DishDto dishDto = new DishDto();
            //dishDto拷贝item
            BeanUtils.copyProperties(item,dishDto);
            Long categoryId = item.getCategoryId();
            //条件构造器
            LambdaQueryWrapper<Category> queryWrapper1 = new LambdaQueryWrapper<>();
            //过滤条件
            queryWrapper1.eq(Category::getId,categoryId);
            Category one = categoryService.getOne(queryWrapper1);

            if(one!=null){
                String name1 = one.getName();
                dishDto.setCategoryName(name1);
            }
            return dishDto;
        }).collect(Collectors.toList());
        dishDtoPage.setRecords(list);
        return R.success(dishDtoPage);
    }

    /**
     * 根据菜品id查找菜品信息
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> getByIdWithFlavor(@PathVariable Long id){
        DishDto dishDto = dishService.getByIdWithFlavor(id);
        return R.success(dishDto);
    }

    /**
     * 更改菜品
     * @param dishDto
     * @return
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto){
        dishService.updateWithFlavor(dishDto);
        //清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);
        return R.success("修改成功！");
    }

    /**
     * 更改菜品状态
     * @param status
     * @param ids
     * @return
     */
    @PostMapping("/status/{status}")
    public R<String> updateByStatus(@PathVariable int status,@RequestParam("ids") List<Long> ids){
        List<Dish> list = dishService.listByIds(ids);
        list=list.stream().map((item->{
            item.setStatus(status);
            return item;
        })).collect(Collectors.toList());
        dishService.updateBatchById(list);
        return R.success("状态改变成功！");
    }

    /**
     * 删除菜品
     * @param ids
     * @return
     */
    @DeleteMapping
    public R<String> Delete(@RequestParam("ids") List<Long> ids){
        dishService.removeWithFlavors(ids);
        return R.success("删除成功！");
    }

    /**
     * 展示菜品，就是普通查全部，状态码为1才行
     * @param dish
     * @return
     */

    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish){
        List<DishDto> dishDtoList = null;
        //动态构造key
        String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();//dish_1397844391040167938_1
        //先从redis中获取缓存数据
        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);
        if(dishDtoList != null){
            //如果存在，直接返回，无需查询数据库
            return R.success(dishDtoList);
        }
        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null ,Dish::getCategoryId,dish.getCategoryId());
        //添加条件，查询状态为1（起售状态）的菜品
        queryWrapper.eq(Dish::getStatus,1);
        //添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        dishDtoList = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item,dishDto);

            Long categoryId = item.getCategoryId();//分类id
            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);
            if(category != null){
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }

            //当前菜品的id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId,dishId);
            //SQL:select * from dish_flavor where dish_id = ?
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
            dishDto.setFlavors(dishFlavorList);

            return dishDto;
        }).collect(Collectors.toList());
        //如果不存在，需要查询数据库，将查询到的菜品数据缓存到Redis
        redisTemplate.opsForValue().set(key,dishDtoList,60, TimeUnit.MINUTES);
        return R.success(dishDtoList);
    }
}    